Question

OK, I have a spring mvc based json web service. This is a test app, I have never seen a problem like this when building spring mvc based restful json services. The output of my test service always returns and empty json object followed by && followed by the data i want to return. So the result looks like this:

{} && {“status”:200,”serverTime”:”January 6, 2013 7:35:45 PM EST”}

The code for my controller method to process this very simple GET request is:

    @RequestMapping(value = "/test.json", method = RequestMethod.GET)
public ModelMap test(ModelMap m, HttpServletRequest request,
        Locale locale) {
    Date date = new Date();
    DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG,
            DateFormat.LONG, locale);

    String formattedDate = dateFormat.format(date);

    m.addAttribute("serverTime", formattedDate);
    m.addAttribute("status", 200);

    return m;
}

I cant for the life of me figure out where that extra empty {} json object is coming from. my spring config looks like this:

<beans:bean
    class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <beans:property name="mediaTypes">
        <beans:map>
            <beans:entry key="html" value="text/html" />
            <beans:entry key="json" value="application/json" />
        </beans:map>
    </beans:property>
    <beans:property name="defaultViews">
        <beans:list>
            <beans:bean
                class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
                <beans:property name="prefixJson" value="true" />
            </beans:bean>
        </beans:list>
    </beans:property>
    <beans:property name="viewResolvers">
        <beans:list>
            <beans:bean class="org.springframework.web.servlet.view.UrlBasedViewResolver">
                <beans:property name="viewClass"
                    value="org.springframework.web.servlet.view.JstlView" />
                <beans:property name="prefix" value="/WEB-INF/views/" />
                <beans:property name="suffix" value=".jsp" />
            </beans:bean>
        </beans:list>
    </beans:property>

Any help would be greatly appreciated. I have blown through 6 hours on a sunday trying to figure out why this is happening.

Answer 1

From the MappingJacksonJsonView javadoc :

public void setPrefixJson(boolean prefixJson)

Indicates whether the JSON output by this view should be prefixed with
“{} && “. Default is false. Prefixing the JSON string in this manner
is used to help prevent JSON Hijacking. The prefix renders the string
syntactically invalid as a script so that it cannot be hijacked. This
prefix does not affect the evaluation of JSON, but if JSON validation
is performed on the string, the prefix would need to be ignored.

So did you try with prefixJson set to false ?

<beans:bean
    class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <beans:property name="mediaTypes">
        <beans:map>
            <beans:entry key="html" value="text/html" />
            <beans:entry key="json" value="application/json" />
        </beans:map>
    </beans:property>
    <beans:property name="defaultViews">
        <beans:list>
            <beans:bean
                class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
                <beans:property name="prefixJson" value="false" />
            </beans:bean>
        </beans:list>
    </beans:property>
    <beans:property name="viewResolvers">
        <beans:list>
            <beans:bean class="org.springframework.web.servlet.view.UrlBasedViewResolver">
                <beans:property name="viewClass"
                    value="org.springframework.web.servlet.view.JstlView" />
                <beans:property name="prefix" value="/WEB-INF/views/" />
                <beans:property name="suffix" value=".jsp" />
            </beans:bean>
        </beans:list>
    </beans:property>